;; Please add these lines in your .emacs(_emacs) or use customize.
;;
;;(setq send-mail-function 'smtpmail-send-it) ; if you use `mail'
-;;(setq message-send-mail-function 'smtpmail-send-it) ; if you use `message'
+;;(setq message-send-mail-function 'smtpmail-send-it) ; if you are using Gnus.
;;(setq smtpmail-default-smtp-server "YOUR SMTP HOST")
;;(setq smtpmail-local-domain "YOUR DOMAIN NAME")
;;(setq smtpmail-sendto-domain "YOUR DOMAIN NAME")